Sony Xperia Z4 Tablet Stock ROM SGP771_28.0.A.8.260_1295-6955_Customized-DE

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Senior Member
Aug 29, 2009
Hello to the forum,

I'd like to root my Sony Xperia Z4 Tablet (SGP771). When I bought it on eBay, it had firmware Android 7.1.1 (SGP771_32.4.A.1.54_1295-6955_Customized-DE), so I have to downgrade it to Lollipop or Marshmallow to use the "Dirty Cow" exploit, being able to backup my TA-partition.
I tried several Stock ROM's (Android 5.0.2, Andoid 6.0.1) which had another customization than DE. And after flashing the keeps rebooting in the "Starting Apps" sequence (just after showing the "Android"-logo). And I don't know, what causes this behaviour because I used only stock ROM's and the Bootloader is locked and haven't been unlocked before (DRM keys are still intact). And when reflashing the Android 7.1.1 firmware this strange behaviour is gone...
So I think I really have to downgrade to a Customized-DE Lollipop-/Marshmallow-firmware to be able to backup my TA-partition.
So can someone provide my with a download link of a SGP771_28.0.A.8.260_1295-6955_Customized-DE (or as alternative: SGP771_32.1.A.1.301_1295-6955_Customized-DE) stock ROM?

Thanks in advance and regards

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